ECONOMIZERS. 8/2014 Supersedes 6/2014

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1 S Litho U.S.A /2014 Supersedes 6/2014 K1ECON S INSTALLATION INSTRUCTIONS FOR S AND OUTDOOR AIR HOODS USED WITH KG/KC/KH 024, 030, 036, 048, 060, 072, 090 UNITS Note - Disregard shipping and packing list and installation sections when dampers are factory-installed. Shipping and Packing List Package 1 of 1 contains: 1- Economizer damper assembly A 1- GED B (gravity exhaust/barometric relief damper) assembly 1- Exhaust hood kit containing: 1-Exhaust hood top A 2-Hood sides C 1-GED seal C 1- Outdoor air hood kit containing: 1-Outdoor air hood top A 2-Hood sides D 1- Mist eliminator filter D 2- Mist eliminator filter brackets D 1- Bag assembly containing: #10-32 X 1/2 Thread-forming screws #10-16 X 5/8 Self-drilling screws #8-32 X 1/2 Thread-forming screws Mixed air sensor (R1) Mixed air sensor bracket (10U56 & 57 only) 2-Wire ties (90W61 & 62 only) A Already in place when economizer is factory-installed. B Optional GED already installed in field-installed economizer C Shipped under the exhaust air cover when economizer is factory-installed. D Shipped in the blower section when economizer is factory-installed. Order Of Installation: Return air cover (horizontal airflow) Economizer Mixed air sensor (R1) Remove GED (horizontal airflow and PEF options) Optional OA/RA sensors Power exhaust fans GED in lower hood (horizontal and PEF options) RA Transition (horizontal airflow) RA duct (horizontal airflow) Lower outdoor air hood Upper outdoor air hood 08/14 Page 1 WARNING Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Installation and service must be performed by a qualified installer, service agency or the gas supplier Application Part No. 90W U High Performance Unit Application KG/KC KH KG/KC KH The K1ECON economizer is used with KG/KC/KH units in downflow and horizontal air discharge applications. Economizer dampers will modulate to maintain 55 F (13 C) supply air when outdoor air is suitable. The mixed air temperature sensor (R1) measures the supply air sensible temperature. The mixed air sensor is provided in field-installed kits and installed according to these instructions. The mixed air sensor is factory-installed when the unit is equipped with an economizer. Standard Economizer The OA sensible control is the default economizer control. The OA thermostat, S175, is provided in this kit. See table 1 for outdoor and return air (OA and RA) sensor options. Refer to instructions provided with sensors for installation. TABLE 1 STANDARD S Dampers modulate to maintain Sensors 55 F mixed air (R1) when: Single OA Sensible Single OA Enthalpy Differential Enthalpy - 1 in OA & 1 in RA IAQ Sensor OA temperature (S175) is lower than free cooling setpoint. OA temperature and humidity (A7) is lower than free cooling setpoint. OA temperature and humidity (A7) is lower than RA temperature and humidity (A62). CO 2 sensed (A63) is higher than CO 2 setpoint

2 High Performance (Low Leak) Economizer The high performance economizer is equipped with a W7220 control module A6. The default OA temperature sensor or high limit sensor (RT26) is a CEC approved, California Title 24 fixed dry bulb device (provided in this kit). See table 2 for outdoor and return air (OA and RA) sensor options. Refer to manufacturer's instructions provided for more details. TABLE 2 HIGH PERFORMANCE S Dampers modulate to maintain Sensors 55 F mixed air (R1) when: Single OA Sensible DEFAULT - approved for CA Title24 Single OA Enthalpy Not approved for CA Title 24 Differential Enthalpy - 1 in OA & 1 in RA Not approved for CA Title 24 IAQ Sensor OA temperature (RT26) is lower than free cooling setpoint. OA temperature and humidity (A7) is lower than free cooling setpoint. OA temperature and humidity (A7) is lower than RA temperature and humidity (A62). CO 2 sensed (A63) is higher than CO 2 setpoint. CAUTION Danger of sharp metallic edges. Can cause injury. Take care when servicing unit to avoid accidental contact with sharp edges. IAQ SENSING (A63) An IAQ sensor is used when demand control ventilation (DCV) is specified. Damper minimum position can be set lower than traditional minimum air requirements resulting in cost savings. The IAQ sensor allows the A6 to open dampers to traditional ventilation requirements as room occupancy (CO 2 ) increases. For proper operation, the IAQ sensor must provide a 2-10VDC, 100 ohm impedance signal. Connect sensor leads to AQ and AQ1 terminals on the A6 economizer control located in the filter section. UNIT END PANEL UNIT Install Economizer - Downflow 1. Open unit end panel. See figure Install damper assembly through end of unit. Fit opening in bottom of damper assembly over the return air opening. See figure 2. Install Mixed Air Sensor (R1) Standard Economizer Sensor is factory-installed on units equipped with a factory-installed economizer. 1- Disconnect all power to unit and open filter access panel. See figure Locate mixed air sensor wires connected to the T/T1 terminals on the A6 economizer control. 3- Install mixed air sensor, provided in kit, on indoor coil bracket. Secure with screw as shown in figure Locate the plastic conduit on top of the filter rack. Route the mixed air sensor wires through the conduit to the mixed air sensor. See figure Connect wires to terminals on mixed air sensor. See figures 3 and 5. Sensor is not polarity sensitive. High Performance Economizer 1- Disconnect all power to unit and open filter access panel. See figure Locate orange mixed air sensor wires marked MAT 1/MAT 2 in wire bundle. Cut wire ties to separate sensor wiring from bundle. 3- Install mixed air sensor R1, provided in kit, on supply air blower housing as shown in figure Locate the plastic conduit on top of the filter rack. Route the mixed air sensor harness through the conduit to the mixed air sensor. See figure Connect MAT harness to mixed air sensor (R1). FIGURE 1 FILTER ACCESS PANEL Page 2

3 INSTALLATION OUTDOOR AIR LOCATED ON OTHER SIDE OF PANEL. OUTDOOR AIR OPTIONS INCLUDE: S175 Outdoor Air Thermostat (Standard Economizers with Sensible Sensor) RT26 Outdoor Air Temperature Sensor (High Performance Economizers with Sensible Sensors) A7 Outdoor Air Enthalpy Sensor (Standard or High Performance Economizer with Single Enthalpy Sensors) B7 DAMPER MOTOR (STANDARD SHOWN) Note - Take care not to damage the A6 economizer control module and wiring during installation. Remove the corner mullion if necessary. UNIT A6 CONTROL MIXED AIR WIRING IN THIS BUNDLE POWER EXHAUST WIRES ONLY CONNECTED WHEN UNIT IS EQUIPPED WITH POWER EXHAUST RETURN AIR OPENING FIGURE 2 FILTER SECTION J3 P4 INSTALL MIXED AIR (R1) STANDARD WIRE ROUTING CONDUIT A6 CONTROL WIRE TIES R1 MIXED AIR Wiring 1- Locate 15-pin J3 economizer jack harness hanging on left side of filter compartment. J3 is located in the same area on both standard and high performance economizers. See figure Disconnect P3 jumper plug from J3 and retain jumper plug for future troubleshooting. Connect 15-pin P4 economizer plug on A6 economizer control harness to J3 economizer jack. See figure Connect any optional sensors as shown in figure 5 or Bundle power exhaust wires and secure away from other components. If optional power exhaust is installed, wire according to instructions provided with power exhaust. 5- Affix D1 economizer wiring diagram section to inside of compressor access panel. Position diagram to the right of C control wiring diagram section. FIGURE 3 Page 3

4 INSTALL MIXED AIR (R1) HIGH PERFORMANCE R1 MIXED AIR PROVIDED R1 MIXED AIR PROVIDED BLOWER HOUSING MOUNTING BRACKET FIGURE 4 Page 4

5 Field-Installed WIRE CONNECTIONS - STANDARD S SINGLE SENSING A6 CONTROL N1 N 2V P1 P EXH R1 MIXED AIR (PROVIDED) T1 T OPE Discard J104 harness provided in optional A7 sensor kit. A63 IAQ S175 (PROVIDED) OR A7 7 8 AQ1 AQ + S AQ1 AQ SO+ SO SR+ SR 2V DCV 2 Fre Coo B A DIFFERENTIAL SENSING A6 CONTROL N1 N 2V P1 P EXH R1 MIXED AIR (PROVIDED) T1 T OPE Discard J104 harness provided in optional A7 sensor kit. A63 IAQ S175 (PROVIDED) OR A7 A62 DIFFERENTIAL ENTHALPY 7 8 P105 J105 Harnesses Provided In Optional Sensor Kit AQ1 AQ + S A6-SR+ A6-SR AQ1 AQ SO+ SO SR+ SR 2V DCV 2 Fre Coo B A FIGURE 5 Page 5

6 Field-Installed Set DIP switch on RT27 to appropriate setting RA. WIRE CONNECTIONS - HIGH PERFORMANCE S SINGLE AND DIFFERENTIAL SENSIBLE SENSING R1 MIXED AIR (PROVIDED) RT26 OUTDOOR AIR SENSIBLE (PROVIDED) RT27 RA DIFFER ENTIAL SENSIBLE A63 IAQ 8 7 MAT1 MAT2 P104 J104 P105 J105 Harness Provided In Optional Sensor Kit Factory-Installed Factory-Installed A6 CONTROL MAT MAT OAT OAT IAQ2-10 IAQCOM IAQ24V+ ACT2-10 ACTCOM ACT24V+ 1- Replace RT26 with A7. 2- Move wiring on A6 controller as shown. Discard harness provided in optional sensor kit. 3- Set DIP switch on A7 to appropriate setting OA. R1 MIXED AIR PROVIDED A7 OUTDOOR AIR ENTHALPY A63 IAQ SINGLE ENTHALPY SENSING 8 7 MAT1 MAT2 P104 J104 Factory-Installed Move factoryinstalled wires from OAT to Factory-Installed A6 CONTROL MAT MAT OAT OAT IAQ2-10 IAQCOM IAQ24V+ ACT2-10 ACTCOM ACT24V+ 1- Set DIP switch on A7 to appropriate setting OA. Set DIP switch on A62 to RA. Factory-Installed RT26-1- Two optional enthalpy sensor kits are required. Replace RT26 with A7 from first optional sensor kit. 2- Move wiring on controller A6 as shown. Discard harness provided in first optional sensor kit. 3- Install second optional sensor (A62) kit using harness provided in second kit. Factory-Installed A7-1- One optional enthalpy sensor kit (A62) is required. Install optional temperature & humidity sensor kit using harness provided in kit. R1 MIXED AIR PROVIDED A7 OUTDOOR AIR ENTHALPY A62 RETURN AIR ENTHALPY A63 IAQ DIFFERENTIAL ENTHALPY SENSING 8 7 FIGURE 6 Page 6 MAT1 MAT2 P104 J104 Move factoryinstalled wires from OAT to P105 J105 Harness Provided In Optional Sensor Kit Factory- Installed Factory-Installed A6 CONTROL MAT MAT OAT OAT IAQ2-10 IAQCOM IAQ24V+ ACT2-10 ACTCOM ACT24V+

7 GED (Barometric Relief Dampers) NOTE - GED is optional when economizer is factory-installed. Remove GED from the economizer (when present) and install in the exhaust air hood when: Optional power exhaust fans are installed Economizer is installed in horizontal air flow 1- Remove the GED from the economizer. See figure Install the GED in the exhaust or lower hood as shown in figure 9. REMOVE GED Outdoor Air Hoods Factory-Installed Economizers Only - Both hood tops and pivot brackets are secured to unit. The lower hood is provided and installed only when the economizer is equipped with an optional GED. Hood parts are located under the exhaust panel and in the blower section. Lift hood tops and assemble hoods as described for field-installed economizers. 1- Make sure all sensors and outdoor air section accessories are installed before installing hoods. 2- Install pivot brackets and seal on unit as shown in figure Assemble hoods as shown in figure 9. Slide top of hoods into the ends of pivot brackets. Install birdscreen bracket after birdscreens are in place. 4- Install hoods on unit as shown in figure Caulk ends of pivot bracket to seal watertight. FIGURE 7 INSTALL PIVOT BRACKETS INSTALL PIVOTING BRACKETS AND GED SEAL (FIELD-INSTALLED S ONLY - SIDE VIEW SHOWN) ( ) UNIT TOP REMOVE AND REUSE SCREWS (2) TO INSTALL BRACKET PIVOT MULLION BRACKET SIDE VIEW (072 & 090) UNIT TOP INSTALL GED SEAL FILLER PANEL (FACTORY- INSTALLED) PIVOT BRACKET MULLION MAKE SURE SEAL IS INSTALLED BEFORE HOOD FIGURE 8 Page 7 POWER EXHAUST SHOWN; GRAVITY EXHAUST LOCATED HERE WHEN UNIT IS NOT EQUIPPED WITH PED

8 ASSEMBLE HOODS OUTDOOR AIR HOOD SECURE TOP BRACKET WITH SCREW AFTER BIRDSCREEN IS IN PLACE BIRDSCREEN INSTALL LOWER BRACKET BEFORE INSTALLING BIRDSCREEN EXHAUST OR LOWER HOOD LOWER HOOD INSTALLED ONLY WHEN IS EQUIPPED WITH A GED GED INSTALLED IN HOODS WHEN POWER EXHAUST IS PRESENT. GED INSTALLED IN POWER EXHAUST LOCATION WHEN UNIT IS NOT EQUIPPED WITH POWER EXHAUST. SEE FIGURE 7. FIGURE 9 Page 8

9 INSTALL HOODS ( SHOWN) SIDE VIEW ( ) CAULK UNIT TOP PIVOT BRACKET HOOD MULLION INTAKE CAULK SIDE VIEW (072 & 090) UNIT TOP LOWER HOOD INSTALLED ONLY WHEN IS EQUIPPED WITH A GED FILLER PANEL (FACTORY- INSTALLED) PIVOT BRACKET MULLION HOOD EXHAUST FIGURE 10 Install Economizer - Horizontal A field fabricated return air duct transition and duct inlet must be installed in horizontal applications. 1- Remove unit end panel. See figure Install the downflow return air cover in horizontal airflow applications. Secure with #10 sheet metal screws provided in kit. See figure Make sure the horizontal return air cover on the back side of the unit remains in place. The opening is used when an economizer is not installed. See figure Install the economizer and R1 mixed air sensor and connect wiring as shown in appropriately named sections of this manual. UNIT END PANEL DOWNFLOW RETURN AIR COVER UNIT FIGURE 11 BACK OF UNIT SUPPLY AIR HORIZONTAL AIRFLOW DO NOT ATTACH RETURN AIR DUCTWORK HERE RETURN AIR FIGURE Install the field-fabricated return air duct transition and duct inlet on the unit end. See figure 13. Support the transition and duct inlet as needed. 6- Install the lower (exhaust) hood on the return air duct. The barometric relief dampers should already be installed in the hood as shown in the Barometric Relief Damper section of this manual. 7- Install the upper hood on the unit as shown in appropriate section of this manual. Page 9

10 TYPICAL HORIZONTAL APPLICATION TOP VIEW DAMPERS Barometric Relief Hood and Dampers RETURN AIR DUCT SUPPLY AIR DUCT SUPPLY AIR OUTLET BACK VIEW HORIZONTAL SUPPLY AIR OPENING RETURN AIR DUCT TRANSITION This opening not used in Horizontal Applications with Economizer RETURN AIR INLET OUTDOOR AIR HOOD HORIZON- TAL RETURN AIR OPENING EXHAUST HOOD EXHAUST AIR FIGURE 13 RETURN AIR DUCT TRANSITION RETURN AIR DUCT INLET Economizer Control (A6) - Standard Economizer LEDs A steady green Free Cool LED indicates that outdoor air is suitable for free cooling. A steady green DCV LED indicates that the IAQ reading is higher than setpoint requiring more fresh air. See figure 14. FREE COOLING SETPOINT NOTE - The following conditions assume unit is operating during occupied time period. Single Temperature or Enthalpy Sensing: The economizer control (A6) setpoint may be adjusted when an enthalpy (A7) sensor is used to determine outdoor air suitability, See figure 14. Free cooling will be enabled when outdoor air temperature or enthalpy are lower than the free cooling setpoint. The free cooling setpoint for sensible temperature sensors is 55 F. Table 3 shows the free cooling setpoints for enthalpy sensors. Use the recommended setpoint and adjust as necessary. A6 CONTROL 2V EXH 2V DCV 2V Free Cool B A Open EXH Set 10V C D Min Pos DCV Max 10V DCV Set 10V FREE COOLING SETPOINT; A=Completely counterclockwise D=Completely clockwise FIGURE 14 DAMPER MINIMUM POSITION IAQ MAXIMUM POSITION (set higher than minimum position) DCV LED IAQ SETPOINT FREE COOL LED Page 10

11 For example: At setting A (table 3), free cooling will be enabled when outdoor air enthalpy is lower than 73 F and 50% RH. If indoor air is too warm or humid, lower the setpoint to B. At setting B, free cooling will be enabled at 70 F and 50% RH. Differential Sensing: Two sensors can be used to compare outdoor air to return air. When outdoor air is cooler than return air, outdoor air is suitable for free cooling. Adjust the free cooling setpoint to D in this application. When return air is cooler than outdoor air, the damper will modulate to the minimum position. TABLE 3 ENTHALPY FREE COOLING SETPOINTS Control Setting Enthalpy Setpoint At 50% RH A* 73 F (23 C) B 70 F (21 C) C 67 F (19 C) D 63 F (17 C) DCV SET AND DCV MAX SETTINGS The DCV SET potentiometer is factory-set at approximately 50% of the potentiometer range. Using a standard ppm CO 2 sensor, dampers will start to open when the IAQ sensor reads approximately 1000ppm. Adjust the DCV SET potentiometer to the approximate setting specified by the controls contractor. Refer to figure 14. The DCV MAX potentiometer is factory-set at approximately 50% of the potentiometer range or 6VDC. Dampers will open approximately half way when CO 2 rises above setpoint. Adjust the DCV MAX potentiometer to the approximate setting specified by the controls contractor. Refer to figure 14. NOTE - DCV Max must be set higher than economizer minimum position setting for proper demand control ventilation. Economizer Control (A6) - High Performance Economizer NOTE - The A6 economizer control will be in the setup mode for the first sixty minutes after powered. If a sensor for outdoor air or device (sensor, actuator) is disconnected during the set up mode, the A6 will not alarm that failure. The R1 mixed air sensor is a system critical sensor; if the mixed air sensor is removed during the set up mode, the A6 will alarm. After sixty minutes the A6 will change to operation mode and all components removed or failed will alarm in the operation mode. Page 11 INITIAL SETUP Factory-Installed Economizer - The A6 economizer control is pre programmed and a limited number of parameters need to be set during the initial setup in the field. See Setup and Configuration Factory-Installed Economizer section. Field-Installed Economizer - A default program must be modified for proper operation in each application. This is done during the initial setup procedure. See Setup and Configuration Field-Installed Economizer section. A6 CONTROL KEYPAD MENU UP / EXIT USING THE KEYPAD MOVE BACKWARD THROUGH MENUS FIGURE 15 MOVE FORWARD THROUGH MENUS SELECT AND CONFIRM CHANGES Use the keypad as follows: - Navigate to the desired menu. - Press the button (enter) to display the first item in the currently displayed menu. - Use the and buttons to scroll to the desired parameter. - Press the enter button (enter) to display the value of the currently displayed item. - Press the button to increase (change) the displayed parameter value. a - Press the button to decrease (change) the displayed parameter value. a - Press the enter button (enter) to accept the displayed value and store it in non-volatile RAM. - CHANGE STORED displays. - Press the button (enter) to return to the current menu parameter. - Press the button (MenuUp/Exit) to return to the previous menu. a When values are displayed, pressing and holding the or button causes the display to automatically increment.

12 MENU STRUCTURE The menus in display order are: STATUS SETPOINTS SYSTEM SETUP ADVANCED SETUP CHECKOUT ALARMS For a complete list of parameters refer to the Honeywell installation manual provided in this kit. IMPORTANT - Menu parameters will be different depending on each configuration. For example: if a DCV (CO 2 ) sensor is not used, none of the DCV parameters will appear and only MIN POS will display. If a CO 2 sensor is used, the DCV SET, VENTMIN and VENTMAX will appear. FREE COOLING SETPOINT Single OA Sensible Sensing (Default) The default free cooling setpoint or high limit setpoint is 63 F. This means that the outdoor air is suitable for free cooling at 62 F and below and not suitable at 64 F and above. This setpoint is adjustable. For California Title 24 compliance, adjust the free cooling setpoint based on: -The climate zone where the unit is installed. See table 4. -The setpoint requirement published by the California Energy Commission. See Section Prescriptive Requirements for Space Conditioning Systems of the 2013 Building Energy Efficiency Standards. NOTE - Values in the referenced standard will supersede values listed in table 4. TABLE 4 FREE COOLING SETPOINT - SINGLE SENSIBLE Climate Zone Setpoint 1, 3, 5, F 2, 4, F 6, 8, 9 71 F 7 69 F To adjust the setpoint, navigate to the SETPOINTS menu and change the DRYBLB SET parameter accordingly. Single OA Enthalpy Sensing (Optional) - The controller uses enthalpy boundary curves for economizing when used with an enthalpy sensor. Refer to the Honeywell installation instruction for details. Page 12 Differential Sensing (Optional) Two sensors can be used to compare outdoor air to return air. When outdoor air is cooler than return air, outdoor air is suitable for free cooling. When return air is cooler than outdoor air, the damper will modulate to the minimum position. SETUP AND CONFIGURATION - FACTORY-INSTALLED Program the following parameters into the controller. Navigate to the specific menus to make the changes required. IMPORTANT - During setup, the economizer control is live at all times. The setup process uses a hierarchical menu structure. Press the and arrow buttons to move forward and backward through the menus and press the button to select and confirm setup item changes. 1- In the SYSTEM SETUP Menu INSTALL (MM/DD/YY) enter installation date FAN CFM ( ) enter rooftop unit indoor blower CFM AUX1 OUT (NONE) enter SYS if controller is wired for remote alarm monitoring. 2- In the SETPOINTS Menu MIN POS ( VDC) refer to minimum position setting section for details. SETUP AND CONFIGURATION - FIELD-INSTALLED Program the following parameters into the controller. Navigate to the specific menus to make the changes required. IMPORTANT - During setup, the economizer control is live at all times. The setup process uses a hierarchical menu structure. Press the and arrow buttons to move forward and backward through the menus and press the button to select and confirm setup item changes. 1- In the SYSTEM SETUP Menu INSTALL (MM/DD/YY) enter installation date EQUIPMENT (CONV) AUX2 IN (HEAT W1) FAN SPEED (1SPEED) FAN CFM ( ) enter indoor blower (CFM) of rooftop unit. AUX1 OUT (NONE) change to SYS if A6 controller is wired for remote alarm monitoring. OCC (INPUT)

13 2- In the ADVANCED SETUP Menu MA LO SET (45ºF) FREEZE POS (CLOSE) STG3 DLY (2HRS) SD DMPR POS (CLOSED) 3- In the SETPOINTS Menu MA SET (55ºF) LO T LOCK (32ºF) MIN POS ( VDC) adjust VDC value until desired fresh air setpoint is reached. DEMAND CONTROL VENTILATION (DCV) When a 2 10VDC CO 2 sensor is wired to the controller (leads provided), the DCV SET, VENTMIN, and VENTMAX parameters will appear under SETPOINTS menu. Navigate to the SETPOINTS menu to adjust setpoints as desired. Refer to the Honeywell manual provided for more details. ALARM MONITORING The controller is equipped with a 24V output signal that can be configured for remote alarm monitoring. In the SYSTEM SETUP menu change the AUX1 OUT setting to SYS. Refer to figure 16 for wiring connections provided. A6 CONTROL HIGH PERFORMANCE TERMINALS MAT MAT OAT OAT IAQ2-10 IAQCOM IAQ24V+ ACT2-10 ACTCOM ACT24V+ A6 CONTROL FIGURE 16 SYSTEM ALARM, ERV, OR EXHAUST FAN 2 OUTPUT AUX2-I OCC E-GND EXH1 AUX1-0 Y2-I Y2-O Y1-I Y1-0 C R Damper Minimum Position Setting - Both Standard and High Performance Economizers NOTE - 24 volts must be provided at unit TB1 terminals R and OC to enable economizer operation (allowing minimum fresh air). Typically a separately ordered thermostat or energy management system with an occupied/unoccupied output is connected between TB1 R and OC terminals. The thermostat will provide 24 volts to the A6 economizer control during the occupied time period to enable economizer minimum position. If a device is not used to enable the economizer, install a jumper wire between TB1 terminals R and OC to maintain minimum position continuously. Make wire connections to TB1 terminals R and OC as shown in literature provided with thermostat or energy management system. 1- Set thermostat to occupied mode if the feature is available. Make sure jumper is in place between TB1 terminals R and OCP if using a thermostat which does not have the feature. 2- Turn on the blower using the thermostat or a jumper between TB1 terminals R and G. 3- Standard Economizers - Rotate MIN POS SET potentiometer to approximate desired fresh air percentage. High Performance Economizers - Navigate to the SETPOINTS menu and select MIN POS. Adjust value (2-10VDC) to the approximate desired fresh air percentage. 3.0 VDC 12% Open Damper 3.5 VDC 18% Open Damper 4.0 VDC 25% Open Damper 4.5 VDC 31% Open Damper 5.0 VDC 37% Open Damper 5.5 VDC 43% Open Damper 6.0 VDC 50% Open Damper NOTE - Damper minimum position can be set lower than traditional minimum air requirements when an IAQ sensor is specified. Page 13

14 4- Measure outdoor air temperature. Mark the point on the bottom line of chart 1 and label the point A (40 F, 4 C shown). 5- Measure return air temperature. Mark that point on the top line of chart 1 and label the point B (74 F, 23 C shown). 6- Measure mixed air (outdoor and return air) temperature. Mark that point on the top line of chart 1 and label point C (70 F, 21 C shown). 7- Draw a straight line between points A and B. 8- Draw a vertical line through point C. 9- Draw a horizontal line where the two lines meet. Read the percent of fresh air intake on the side. 10- Standard Economizers - If fresh air percentage is less than desired, adjust MIN POS SET potentiometer clockwise (further open). If fresh air percentage is more than desired, adjust MIN POS SET potentiometer counterclockwise (less open). Repeat steps 4 through 9 until calculation reads desired fresh air percentage. High Performance Economizers - If fresh air percentage is less than desired, use the A6 keypad to adjust MIN POS values higher (further open). If fresh air percentage is more than desired, adjust MIN POS values lower (less open). Repeat steps 4 through 9 until calculation reads desired fresh air percentage. F C CHART 1 CALCULATE MINIMUM FRESH AIR PERCENTAGE MIXED AND RETURN AIR TEMPERATURE C B F C F -20 C A OUTDOOR AIR TEMPERATURE F C Page 14

15 Standard Economizer Operation When the outdoor air is suitable, dampers will modulate between minimum position and full open to maintain 55 F (12.8 C) supply air. See table 5 for economizer operation when outdoor air is suitable. See table 6 for economizer operation when outdoor air is NOT suitable. IAQ Sensor During the occupied period, dampers will open to DCV MAX when IAQ reading is above setpoint (regardless of thermostat demand or outdoor air suitability). DCV MAX will NOT override damper full-open position. The DCV MAX setting may override damper free cooling position when occupancy is high and outdoor air temperatures are low. NOTE - If R1 senses mixed air temperature below 45 F (7 C), dampers will move to fully closed until mixed air temperature rises to 48 F (9 C). TABLE 5 OPERATION OUTDOOR AIR IS SUITABLE FOR FREE COOLING -- FREE COOL LED ÁÁÁÁ DAMPER THERMOSTAT DEMAND ÁÁÁÁÁ MECHANICAL COOLING UNOCCUPIED OCCUPIED ÁÁÁÁÁ 1 OF No ÁÁÁÁ G Minimum No Y1 Modulating* Á Modulating* No Y2 Modulating* Á Modulating* STAGE 1 *IAQ sensor can open damper to DCV max. 1 Damper position when no occupied/unoccupied signal is available from building thermostat or energy management system. TABLE 6 OPERATION OUTDOOR AIR IS NOT SUITABLE FOR FREE COOLING -- FREE COOL LED OFF ÁÁÁÁÁ DAMPER POSITION THERMOSTAT DEMAND MECHANICAL COOLING ÁÁÁÁÁÁÁ UNOCCUPIED Á OCCUPIED 1 Off Á No G Á Minimum* No Y1 Á Minimum* Stage 1 Y2 Minimum* Stage 1 *IAQ sensor can open damper to DCV max. 1 Damper position when no occupied/unoccupied signal is available from building thermostat or energy management system. Page 15

16 High Performance Economizer Operation OPERATION Refer to table 7 or 8. When the outdoor air is suitable and a thermostat demand calls for 1 st. stage cooling (Y1), the economizer will modulate the dampers between the minimum and fully open positions to maintain a 55 F (12.8 C) mixed air temperature. When there is an increased thermostat demand for second stage cooling (Y2), the economizer damper opens 100% and the economizer controller (A6) will bring on the compressor. At that point, K8 relay will switch from the R1 mixed air sensor to R51 resistor allowing the economizer damper to stay open 100%. The damper will stay open 100% with the compressor running simultaneously until Y2 demand is met. NOTE Because of the sensor location, the mixed air temperature displayed on the economizer controller (A6) is only true when no mechanical cooling or heating is initiated. During mechanical cooling (compressor running), the MA temperature displayed will be the temperature equivalent of the fixed resistor and not the actual MA temperature. TROUBLESHOOTING, ALARMS AND CHECKOUT TESTS Refer to the Honeywell manual provided for details. TABLE 7 OPERATION - NO DCV (CO 2 ) OA Good to ÁÁÁÁ Y1-I ÁÁÁÁÁ Economize? Y2-I ÁÁÁÁ Y1-O ÁÁÁÁ Y2-O Occupied ÁÁÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁÁÁÁ Unoccupied Off Off 0-v/Off 0-v/Off MIN POS ÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ Á ÁÁÁÁÁÁÁ No On Off 24-v/On 0-v/Off MIN POS ÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ Á ÁÁÁÁÁÁÁ On On 24-v/On 24-v/On MIN POS ÁÁÁÁ ÁÁÁÁÁÁÁ Off Off 0-v/Off 0-v/Off MIN POS ÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ ÁÁÁÁ ÁÁÁÁ Yes On Off 0-v/Off 0-v/Off MIN POS to Full-Open to Full-Open ÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁ Á ÁÁÁÁÁÁÁ On On 24-v/On 0-v/Off Full-Open Full-Open ÁÁÁÁ DCV ÁÁÁÁÁ None None TABLE 8 OPERATION - WITH DCV (CO 2 ) ÁÁÁÁ DCV ÁÁÁÁ ÁÁÁÁÁ OA Good to ÁÁÁÁÁ Y1-I Y2-I Y1-O Y2-O ÁÁÁÁÁ Economize? ÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ Occupied Unoccupied ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ Á Off ÁÁÁÁÁ Off ÁÁÁÁÁ 0-v/Off ÁÁÁÁ VENTMIN ÁÁÁÁÁÁÁ No ÁÁÁÁ On ÁÁÁÁÁ Off ÁÁÁÁÁ 24-v/On ÁÁÁÁ VENTMIN ÁÁÁÁÁÁÁ Á On ÁÁÁÁÁ On ÁÁÁÁÁ 24-v/On ÁÁÁÁ 24-v/On ÁÁÁÁÁÁÁ VENTMIN ÁÁÁÁÁÁÁ Below set Á Off ÁÁÁÁÁ Off ÁÁÁÁÁ 0-v/Off ÁÁÁÁ VENTMIN ÁÁÁÁÁÁÁ Yes ÁÁÁÁ On ÁÁÁÁÁ Off ÁÁÁÁÁ 0-v/Off ÁÁÁÁ VENTMIN to Full-OpenÁÁÁÁÁÁÁ to Á On ÁÁÁÁÁ On ÁÁÁÁÁ 24-v/On ÁÁÁÁ Full-Open ÁÁÁÁÁÁÁ Full-Open Á Off ÁÁÁÁÁ Off ÁÁÁÁÁ 0-v/Off ÁÁÁÁ VENTMIN to VENTMAXÁÁÁÁÁÁÁ No ÁÁÁÁ On ÁÁÁÁÁ Off ÁÁÁÁÁ 24-v/On ÁÁÁÁ VENTMIN to VENTMAXÁÁÁÁÁÁÁ Á On ÁÁÁÁÁ On ÁÁÁÁÁ 24-v/On ÁÁÁÁ 24-v/On ÁÁÁÁÁÁÁ VENTMIN to VENTMAXÁÁÁÁÁÁÁ Above set Á Off ÁÁÁÁÁ Off ÁÁÁÁÁ 0-v/Off ÁÁÁÁ VENTMIN to VENTMAXÁÁÁÁÁÁÁ Yes ÁÁÁÁ On ÁÁÁÁÁ Off ÁÁÁÁÁ 0-v/Off ÁÁÁÁ VENTMIN to Full-OpenÁÁÁÁÁÁÁ to Á On ÁÁÁÁÁ On ÁÁÁÁÁ 24-v/On ÁÁÁÁ Full-Open ÁÁÁÁÁÁÁ Full-Open Page 16

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